[Kst] Hierarchy branch close to merge

[Brisset, Nicolas]

> It would be great if people could try it out and let me know 
> if they run into any issues. We'll be merging the changes 
> into trunk soon.
Now, that's excellent news :-) I'm compiling now, but I won't be able to
test it until tomorrow :-(
Overall, the changes look very good to me. We will now need to add
metadata generation to as many datasources as possible :-)

Thanks for your efforts, 

Nicolas